----- BEGIN SCRIPT -----
#!/usr/bin/ruby -w
#
# Following solution can be run from the command line, e.g.:
#
#    $ ./this_program.rb "Black Cat"
#

def all_words_in_filename?(terms, filename)

  result = false

  # Each matching term cannot be followed by an
  # alphanumeric value in the filename.
  terms.each do |term|
    if filename =~ /#{term}(?![a-z0-9])/i
      result = true
    else
      result = false
      break
    end
  end

  return result
end

# Presumably, the following hard-coded array would be dynamically
# populated from reading a directory from disc.
file_list = [
             'Black_Cat.jpg',
             'Black Cat.jpg',
             'Cat.jpg',
             'Cat Is Black.jpg',
             'Cat is black.jpg',
             'Color - black.jpg',
             'Black Catcher.jpg',
             'Black cat22.jpg',
             'Black Cat_22.jpg',
            ]

search_words = ARGV[0].to_s
if search_words.empty?
  puts 'missing multi-word argument'
  exit
end

terms = search_words.split(/\s+/)

i = 1
print "\nSearch Terms: #{terms.join(', ')}\n\n"
file_list.each do |file|
  result = all_words_in_filename?(terms, file)
  a = result ? '*' : ''
  number = (a + i.to_s).rjust(2)
  puts "   #{number}. #{result.to_s.ljust(5)} #{file}"
  i += 1
end
----- END SCRIPT -----